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Description of Business and Other Disclosures - Additional Information (Details) $ in Millions				3 Months Ended
	Apr. 14, 2020 Site	Mar. 25, 2020 USD ($) Site Property	Dec. 17, 2018 Site	Mar. 31, 2021	Mar. 31, 2020
CST Fuel Supply Exchange Agreement [Member]
Concentration Risk [Line Items]
Number of leased convenience store properties acquired | Property		33
Proceeds in exchange for investment | $		$ 14.1
CST Fuel Supply Exchange Agreement [Member] | Wholesale Fuel Supply Contracts/Rights [Member]
Concentration Risk [Line Items]
Number of additional sites		331
Circle K Stores Inc. [Member]
Concentration Risk [Line Items]
Number of sites acquired			191
Number of real property in exchange for acquisition			56
Number of sites previously owned and operated by partnership			17
Collection of rent from real property sites divested			we no longer collect rent from the sites divested in these transactions
Sellers [Member] | Asset Purchase Agreement [Member] | Retail and Wholesale Acquisition [Member]
Concentration Risk [Line Items]
Number of retail stores operated	169
Number of company operated sites	154
Number of commission sites	15
Number of newly leased sites	62
Number of sites under dealer arrangements	107
Number of wholesale fuel distribution	110
Number of third-party wholesale dealer contracts	53
Motor Fuel Gallons [Member]
Concentration Risk [Line Items]
Percentage of product sold, delivered by one carrier				17.00%	15.00%
Rental Income [Member] | Revenue Benchmark
Concentration Risk [Line Items]
Concentration Risk, Percentage				12.00%	12.00%
Supplier Concentration Risk [Member] | Purchases Net [Member] | ExxonMobil, Corp [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage				33.00%	24.00%
Supplier Concentration Risk [Member] | Purchases Net [Member] | BP P.L.C [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage				23.00%	23.00%
Supplier Concentration Risk [Member] | Purchases Net [Member] | Motiva [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage				12.00%	13.00%
Supplier Concentration Risk [Member] | Purchases Net [Member] | Marathon Petroleum Company LP [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage				10.00%
Supplier Concentration Risk [Member] | Purchases Net [Member] | Circle K [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage					11.00%
Supplier Concentration Risk [Member] | Purchases Net [Member] | Other suppliers [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage				10.00%	10.00%

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